public class Computer {
    private String cpu;
    private String memory;
    public  String screen;
    String brand; //品牌default属性

    public Computer(String brand,String cpu,String memory,String screen){
        this.brand=brand;
        this.cpu=cpu;
        this.memory=memory;
        this.screen=screen;
    }
    public void Boot(){
        System.out.println("开机---");
    }
    public void PowerOff(){
        System.out.println("关机---");
    }
    public void Surflnternet(){
        System.out.println("上网---");
    }
}

